Chax as far as I can tell is pretty harmless... the installer has an uninstall button IIRC (it's been awhile since I used it).

The big draw for Chax back in the day was tabbed IM. Now that iChat does it natively, it's less of a draw. But it's still maintained to provide all the other creature comforts it offers. Perhaps of particular mention in your case is the ability to auto-accept file transfers.

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